quebra de dormência em sementes de commelina benghalensis dormancy breaking in commelina benghalensis seeds

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ID: 160843
1994
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Abstract
Com o objetivo de estudar alguns aspectos relacionados à dormência das sementes de trapoeraba (Commelina benghalensis L.), dois experimentos foram conduzidos em condições de laboratório. No primeiro experimento, realizado em 1989, utilizaram-se sementes aéreas e subterrâneas oriundas de Paranavaí-PR e apenas sementes aéreas oriundas de Jaboticabal-SP, todas recém-colhidas, nas modalidades de grandes e pequenas (separadas de acordo com seu peso). Os tratamentos de quebra de dormência foram. escarificação mecânica com lixa; escarificação química com ácido sulfúrico; choque térmico úmido; choque térmico seco, além da testemunha. No segundo experimento, realizado em 1990, utilizaram-se sementes do mesmo lote do experimento anterior, após um ano de armazenamento em câmara a 10o C, sem qualquer tratamento de semente, visando verificar a germinação das sementes. Os resultados indicaram que: 1) o ácido sulfúrico foi o tratamento que proporcionou as maiores porcentagens de germinação (P.G.) e os maiores índices de velocidade de germinação (I.V.G.) em todos os tipos de sementes estudadas; 2) a P.G. e o I.V.G. das sementes recém-colhidas aumentam após um ano de armazenamento; 3) as sementes grandes apresentam maior P.G. e maior I.V.G. que as sementes pequenas; 4) as sementes colhidas em Paranavaí, apresentaram uma tendência de maior P.G. e maior I.V.G. que as colhidas em Jaboticabal.
The objective of this work was to study some aspects related to the dormancy of Commelina benghalensis seeds. Two experiments were conducted under laboratory conditions. ln 1989 freshly harvested aerial and underground seeds from Paranavaí, PR, and aerial seeds from Jaboticabal, SP, were divided by their weight into large and small. Except for a control the seeds were subjected to dormancy breaking treatments: mechanical scarification with abrasive paper; chemical action with sulphuric acid; hot water; dry heating. ln 1990 a further experiment, without dormancy breaking treatment, was conducted with seeds from the same lot, after one year in cold storage at 10o C. The results over a 30-day period were: I) sulphuric acid induced the highest germination (P.G.) and the highest speed of germination index (S.G.I.) in all kinds of seeds studied; 2) the P.G. and the S.G.I. of the seeds seem to increase during storage; 3) the larger seeds showed higher P.G. and S.G.I. than the smaller ones; 4) the seeds from Paranavaí showed a tendency of higher values of P.G. and S.G.I. than those from Jaboticabal.
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rodrigues1994plantaquebra Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Benedito N. Rodrigues;Robinson A. Pitelli
Journal anti-cancer agents in medicinal chemistry
Year 1994
DOI
10.1590/S0100-83581994000200009
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83581994000200009
Keywords
Biology seed dormancy

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